I want to checkout the branch I'm working on then open all the files I've been working on, in that branch, in my text editor. I don't want to fuzzy find them or search through the tree for them or open them once and leave the window open until the PR is merged... No, no.

What ODB does

It runs git diff --name-only origin/master... the same as you could do on the command line. This gets a list of the files that include changes not on master. ODB then creates another command for opening the text editor with each of those files. It then runs that command.